A Velocity Measuring Method Using M-Sequence Signals

Autor: Horita, Motoshi, Nishimura, Akira, Tawara, Kiyoshi, Matsuura, Kohki, Yamamoto, Gaishi
Jazyk: angličtina
Rok vydání: 1983
Zdroj: 金沢大学工学部紀要 = Memoirs of the Faculty of Technology Kanazawa University. 16(1):25-34
ISSN: 0022-832X
Popis: M-sequence signal is a kind of random signals but has periodicity and its autocorrelation function has peaks periodically. M-sequence signal has strong noise immunity when used as a carrier signal because it can bear information in wide frequency band. This paper reports a velocity measuring method using fringe pattern modulated by M-sequence signal. The experimental results of measuring the velocity of a turn-table and water flow are also described. The measurement error obtained was within 1.5 percent and slightly better than a normal error obtained in the case of Laser Doppler Velocimeter which employs equi-spaced fringe pattern in stead of M-sequence pattern. The most significant advantage of this method is that we can measure the velocity precisely even when several particles come into the measuring volume at the same time. This point is very different from the case in the Laser Doppler Velocimeter.
Databáze: OpenAIRE